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Finding the Fourth Proportional to 409,970.40, 614,955.60 and 339,986.40

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Solution

The fourth proportional to 409,970.40, 614,955.60 and 339,986.40 is: 509,979.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,970.40 : 614,955.60 = 339,986.40 : x
  2. Step 2: Convert to fraction form
    409,970.40/614,955.60 = 339,986.40/x
  3. Step 3: Cross multiply
    409,970.40x = 614,955.60 × 339,986.40
  4. Step 4: Simplify right side
    409,970.40x = 209,076,540,603.84
  5. Step 5: Solve for x
    x = 209,076,540,603.84/409,970.40
  6. Step 6: Final answer
    x = 509,979.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.